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<h1 class="title toc-ignore">Anatomy of a Lockfile</h1>



<p><code>renv</code> uses a <strong>lockfile</strong> to capture the
state of your library at some point in time. It is stored as a
collection of <em>records</em>, with different records defining:</p>
<ul>
<li>The version of <code>renv</code> used when generating the
lockfile;</li>
<li>The version of <code>R</code> used in that project;</li>
<li>The R repositories that were active when the lockfile was
created;</li>
<li><em>Package records</em> defining each R package, their version, and
their installation source.</li>
</ul>
<p>Here is an example lockfile, including the packages
<code>markdown</code> and <code>mime</code>:</p>
<pre><code>{
  &quot;R&quot;: {
    &quot;Version&quot;: &quot;4.1.2&quot;,
    &quot;Repositories&quot;: [
      {
        &quot;Name&quot;: &quot;CRAN&quot;,
        &quot;URL&quot;: &quot;https://cloud.r-project.org&quot;
      }
    ]
  },
  &quot;Packages&quot;: {
    &quot;markdown&quot;: {
      &quot;Package&quot;: &quot;markdown&quot;,
      &quot;Version&quot;: &quot;1.0&quot;,
      &quot;Source&quot;: &quot;Repository&quot;,
      &quot;Repository&quot;: &quot;CRAN&quot;,
      &quot;Hash&quot;: &quot;4584a57f565dd7987d59dda3a02cfb41&quot;
    },
    &quot;mime&quot;: {
      &quot;Package&quot;: &quot;mime&quot;,
      &quot;Version&quot;: &quot;0.7&quot;,
      &quot;Source&quot;: &quot;Repository&quot;,
      &quot;Repository&quot;: &quot;CRAN&quot;,
      &quot;Hash&quot;: &quot;908d95ccbfd1dd274073ef07a7c93934&quot;
    }
  }
}</code></pre>
<p>The function <code>renv::snapshot()</code> is used to create this
lockfile, and by default writes these records to the file
<code>renv.lock</code>. Later, if you need to reinstall the specific
package versions as recorded in <code>renv.lock</code>, you can use
<code>renv::restore()</code>.</p>



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